Amazing what a spur to development Pete's original thread has been.
It's been a long road for me to get to this point, v1 performed OK, but not really good enough I didn't think. I tried keeping the Buttress threaded connection of the Laing pump, but found that I could not get performance more than an few % above the stock pump, and never as good as v1. Shame too because I bought an indexable American Buttress threading bar (big$ ), but this is the design I've ended up with.
This basically a development version of the pump head, the CNC code, the feed rates and fixturing process is still being worked out, and I am still working on the mounting arrangement. Performance came first and now that it's up to par, it's details time .
I'm not going to show my volute just yet, as really it's the only thing that separates this pump from the EK and Koolance. Those guys have way more resources to throw at this product than I do. It's a radial O-ring design which allows me to have a much flatter volute than the buttress threaded design. As a result, I could come much closer to a textbook example of a standard pump volute. Of course since there is no longer a threaded ring, I'm using 4 little delrin clamps and stainless M5 button head cap screws.
Now, if you don't mind please give me your thoughts on the following:
1) How important is a second "fillport" at the pump suction? If I were to implement a fillport, it would be a true fillport, i.e. no possibility to use it as the suction since it would have awful flow geometry, and could only be used for de-aerating and filling.
2) How important are pump looks and bling factor? I'm going to try to work out a creative and industrial looking profile, just wondering how much effort should go there.
3) Any other hints and general suggestions to help me? I'd really appreciate it
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